MX29LV040QC-70 View Datasheet(PDF) - Macronix International

Part Name

Description

MFG CO.

MX29LV040QC-70

4M-BIT [512K x 8] CMOS SINGLE VOLTAGE 3V ONLY EQUAL SECTOR FLASH MEMORY

Macronix International 

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CHIP UNPROTECT

The MX29LV040 also features the chip unprotect mode,

so that all sectors are unprotected after chip unprotect is

completed to incorporate any changes in the code. It is

recommended to protect all sectors before activating

chip unprotect mode.

To activate this mode, the programming equipment must

force VID on control pin OE and address pin A9. The CE

pins must be set at VIL. Pins A6 must be set to VIH.

Refer to chip unprotect algorithm and waveform for the

chip unprotect algorithm. The unprotection mechanism

begins on the falling edge of the WE pulse and is

terminated on the rising edge.

It is also possible to determine if the chip is unprotected

in the system by writing the Read Silicon ID command.

Performing a read operation with A1=VIH, it will produce

00H at data outputs(Q0-Q7) for an unprotected sector.

It is noted that all sectors are unprotected after the chip

unprotect algorithm is completed.

MX29LV040

P/N:PM0722

REV. 0.7, JUL. 12, 2001

16

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